#include<iostream>
 #include<cstdio>
int main()
{
  //C
  printf("hello printf->stdout\n");
  fprintf(stdout,"hello fprintf->stdout\n");
  fprintf(stderr,"hello fprintf->stderr\n");
  //C++
  std::cout<<"hello cout->cout"<<std::endl;
  std::cerr<<"hello cerr ->cout"<<std::endl;
  return 0;
}
